468 
SCOUTING FOR GIRLS 
for pacing to obtain -the average length of one’s pace, as 
suggested in a later paragraph under Useful Personal 
Measurements. 
(2) Telemetry. The second method is used in deter- 
mining long distances for artillery practice and in survey- 
ing. It is called telemetry and the use of an instrument 
is necessary. 
(3) Triangulation. This is a long word but one a 
Scout can learn to know and use. It means that the 
length of the distance can be computed by means of 
triangles staked out on the grounds, when to measure 
with a line would be impossible or not satisfactory. It 
is not necessary to make the sides of the triangles, only 
the points need to be indicated as it is the relative position 
of the points which make a triangle and not the lines. 
These can be marked in the country with poles, stakes 
or stones ; in the city Scouts could stand in position at the 
necessary points. 
When using triangles where shall a Scout place the 
points ? 
If the width of a stream, road or field is wanted 
choose a place where its sides are on about the same 
level and if possible fairly straight. Then proceed as 
shown in the accompanying diagram a. Select a conspi- 
cuous object on the farther bank of the stream, such as a 
tree, bush or stone and call it X. Stand opposite it at the 
near edge of the stream or on the bank, and place a 
stake A in front of you keeping X and A in direct line, 
walk backward a few feet and plant a stake B in direct 
line with them. Right or left face — -(for a right angle 
is necessary at this point). Pace a straight line for say 
20 feet and plant a stake C, one high enough to be plainly 
seen ; continue the straight line for say 10 feet more and 
plant a stake D. Turn inland, (another right angle 
is here necessary) and pace to the point where the ob- 
